Programming Reference:Build System
Early versions of BCI2000 (2.x and earlier) were dependent on the visual components library (VCL) by Borland and could only be built using the Borland compiler. Since version 3.0, Qt has replaced the VCL because it is not only compiler-independent, but also platform-independent.
To support many platforms and compilers, BCI2000 is using CMake http://www.cmake.org to generate Makefiles, project files, and Visual Studio solutions. CMake can be thought of as a meta-makefile; it examines your build environment and sets up a Visual Studio project, a Code::Blocks project, or a Unix Makefile which is custom tailored to your environment. Due to the wide variation in possible build environments, BCI2000 can not come with a fixed Visual Studio solution file, or a fixed Eclipse project file (such fixed solutions would always end up costing users a lot of effort). Thus, the number of platforms BCI2000 supports is mainly limited by the number of platforms and compilers for which CMake has generators.
- Supported Operating Systems
- 32 and 64-bit Windows systems
- Windows 7, 8, 10 (Vista not recommended)
- Support for Unix-like systems (macOS, Linux) is currently limited to building mex files
- Supported Compilers
- Visual Studio 2012 (express if disabling MFC-based projects)
- Visual Studio 2015, 2017 full and community editions
- MinGW is currently unsupported
- Supported IDEs
- Qt Creator
- Visual Studio 2012, 2015, 2017
How To Build Using CMake
- Ensure that your compiler and IDE are installed on the computer. This means that Visual Studio is installed if you intend to use Visual Studio, or that MinGW and QtCreator are installed if you intend to use QtCreator as your IDE and MinGW as your compiler.
- Download and install a recent version of cmake (Version 3.11.0 at the time of this writing) from http://www.cmake.org/ - Add to path for all users.
- Create a build directory inside or outside your BCI2000 source tree, open a Windows shell inside the build directory (e.g., "BCI2000_build64"), and run "cmake-gui path/to/bci2000/build/directory".
- In the cmake GUI, click "configure", and select the compiler of your choice.
- Wait while cmake examines your computer, finds Qt and your compiler, and generates applicable project files for your system.
- If you are using Visual Studio 2015, and cmake fails to find your compiler, then you may need to copy the files rc.exe and rcdll.dll from one of your Program Files (x86)/WindowsKits bin folders to Program Files (x86)/Microsoft Visual Studio 14.0/VC/bin.
- CMake will report a number of warnings regarding Qt not being available. If you have Qt installed on your machine, you can now set the CMake variable Qt5_DIR to your Qt installation's lib/cmake/Qt5 directory, and click "configure" again.
- Finally, in the cmake GUI, click "generate" to generate a project or solution file.
- Open the generated project/solution (for Visual Studio, this is called "BCI2000.sln") in the IDE of your choice. Or, if you are using MinGW make, run the make command from the command prompt using the Makefile in the top-level "build" directory. Refer to your IDE's help for IDE-specific instructions on how to build an application.
- Even though CMake must always be run from one top-level place (the "build" directory), and will spend several seconds generating a Makefile or project file for the whole BCI2000 tree at once, this does not mean that you have to compile all of BCI2000 at once. In the next step, if you're using MinGW-make on the command-line, you could for example type "make Operator" or "make SignalGenerator" to build only selected modules (again, you should be in the top-level "build" directory when you do this). Visual IDEs usually have their own equivalent of this: for example, in Visual Studio 2008, you can right-click on a particular module and select "Build".
- If you build the targets "NewBCI2000Module" and "NewBCI2000Filter", this will create two new binary executables with these names. They will be found in the top-level "build" directory (and, in common with CMake and make, they should be launched only from this location). Launch NewBCI2000Module to create a new project in order to compile your own custom module. Launch NewBCI2000Filter to create a new filter and add it to a project you have already created. In either case, you may need to re-run CMake (step 3) in order to ensure these changes are reflected in the project file.
- MinGW, Borland and other single configuration generators within CMake only generate one configuration at CMake Run-time. By default, this is set to the release configuration. It can be set - along with specific compiler options - in BCI2000/build/cmake/BuildConfigurations.cmake. The Visual Studio generator will ignore settings in this file. To turn on a debug build in a single configuration generator, run cmake -i in the build directory and set CMAKE_BUILD_TYPE to "Debug" when prompted.
- All Compilers handle non standard characters, such as umlauts and characters with accents or tildes, differently. Because BCI2000 currently has no standardized way of handling non standard characters in a cross-compiler environment, it is strongly recommended that - for the time being - special characters are not used in localizations during the development of BCI2000 Ver 3.0.
Now that BCI2000 is open to a number of platforms, and compilers, support may not exist for every possible compiler/platform available. Certain compilers do not optimize code as well as others, and this behavior may lead to poor system latencies during BCI2000 experiments. The supported compilers have been rigorously tested and confirmed to be adequate for compiling the BCI2000 sources. If you wish to use a different compiler, be sure to run tools/BCI2000Certification in order to confirm your setup. CMake is a powerful tool, but in the end, ability to compile the sources is completely up to the IDE/compiler choice. If your IDE/compiler choice is not listed above, it is strongly urged that you to consider using one which is supported. If you run into problems using an unsupported IDE/compiler combination, you can try to find help at the BBS - http://www.bci2000.org/phpbb/index.php. BCI2000 should compile as effortlessly as possible on supported platforms.